CONTENTS 



Introductory 41 



Injuries to trees , 41 



Object of bulletin 41 



White marked tussock moth, Notolophits leucostigma v . . . . 41 



Characteristics 42 



Life history 43 



Remedies 43 



Elm leaf beetle, Galerucella luteola 44 



Characteristics 44 



Remedies . . 45 



Elm bark louse, Gossyparia ulmi , 46 



Characteristics 46 



Remedies 46 



Tent caterpillars, Clisiocampa disstria : ' Clisiocampa americana 46 



Characteristics 47 



Life history 47 



Remedies 47 



Fall web worm, Hyphantria cunea 48 



Remedies , 49 



Borers in trunk and limbs 49 



Indications of attack 49 



Elm and maple borers 49 



Pigeon Tremex 50 



Leopard moth 50 



Remedies . . 51 



Cottony maple tree scale insect, Pulvinaria innumerabilis 52 



Remedies 52 



Value of our native birds , 52 



Spraying trees 53 



Rules for spraying 53 



Proper apparatus 54 



Arsenical compounds 55 



Contact insecticides 56 



Explanation of plates 57 



Index 59 



